[Tracking] procfs scan performance improvements

[ekoops]

Procfs scan in linux platform introduces overhead. Fortunately, in the current codebase, there is room for improvements. This issue aims at documenting the effort of improving information gathering from procfs.

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• perf(userspace/libscap): rewrite /proc/<pid>/comm parsing logic #2785
• perf(userspace/libscap): rewrite /proc/<pid>/environ parsing logic #2786
• perf(userspace/libscap): rewrite /proc/<pid>/cmdline parsing logic #2787
• refactor(userspace/libscap): rename helper reading /proc/<pid>/cwd #2788
• perf(userspace/libscap): rewrite /proc/<pid>/status parsing logic #2789
• perf(userspace/libscap): rewrite /proc/<pid>/stat parsing logic #2793
  • fix(userspace/libscap) fix /proc/pid/stat read operation #2794
• perf(userspace/libscap): rewrite scap_linux_getpid_global() logic #2795
• perf(userspace/libscap): rewrite /proc/<pid>/loginuid parsing logic #2797
• perf(userspace/libscap): rewrite scap_linux_is_thread_alive() logic #2798
• refactor(userspace/libscap): rename helper reading /proc/<pid>/root #2799
• fix(userspace/libscap): re-add interruption resiliency to reads #2800
• perf(userspace/libscap): improve scap_proc_add_from_proc() logic #2801
• perf(userspace/libscap): rewrite scap_linux_get_device_by_mount_id() #2809
• refactor(userspace/libscap/linux): extract string helpers #2810
• perf(userspace/libscap): rewrite /proc/pid/fdinfo/fd parsing logic #2813
• perf(userspace/libscap): rewrite /proc/pid/net/{tcp,udp,raw} parsing logic #2815
• perf(userspace/libscap): rewrite /proc/pid/net/{tcp6,udp6,raw6} parsing logic #2816
• perf(userspace/libscap): rewrite /proc/pid/net/unix parsing logic #2823
• fix(userspace/libscap): rewrite /proc/pid/net/netlink parsing logic #2831